The circle game

In 1970, the same year that Joni Mitchell released an album with the song The Circle Game, the United States laid the foundation for a national effort to control air pollution through the passage of the first modern Clean Air Act (CAA) and the formation of the U.S. Environmental Protection Agency (EPA). While much has changed since then, the fundamental approach embodied in the 1970 CAA to formalize respective roles and responsibilities in an air quality management approach of the kind illustrated below remains today.

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